YES Problem: b(a(a(b(a(x1))))) -> a(b(a(a(b(b(a(a(b(x1))))))))) Proof: String Reversal Processor: a(b(a(a(b(x1))))) -> b(a(a(b(b(a(a(b(a(x1))))))))) Bounds Processor: bound: 1 enrichment: match automaton: final states: {1} transitions: b1(25) -> 26* b1(39) -> 40* b1(36) -> 37* b1(32) -> 33* b1(35) -> 36* b1(29) -> 30* b1(26) -> 27* b1(22) -> 23* a1(21) -> 22* a1(33) -> 34* a1(27) -> 28* a1(34) -> 35* a1(31) -> 32* a1(38) -> 39* a1(24) -> 25* a1(23) -> 24* a1(37) -> 38* a1(28) -> 29* f20() -> 2* a0(4) -> 5* a0(2) -> 3* a0(8) -> 9* a0(9) -> 10* a0(5) -> 6* b0(10) -> 1* b0(6) -> 7* b0(7) -> 8* b0(3) -> 4* 30 -> 35,32,6 7 -> 21* 40 -> 22* 1 -> 34,3,5 3 -> 31* problem: Qed